Store field trial parameters in shared memory

base/metrics/field_trial_unittest.cc

Index: base/metrics/field_trial_unittest.cc
diff --git a/base/metrics/field_trial_unittest.cc b/base/metrics/field_trial_unittest.cc
index 0ad13a22be77e00e85cde99aa41b72af63fa79c5..226d3d211d3f57585fe707c57d20f4f9d6883167 100644
--- a/base/metrics/field_trial_unittest.cc
+++ b/base/metrics/field_trial_unittest.cc
@@ -1194,4 +1194,29 @@ TEST(FieldTrialListTest, AddTrialsToAllocator) {
   EXPECT_EQ(save_string, check_string);
 }
 
+TEST(FieldTrialListTest, AssociateFieldTrialParams) {
+  std::string trial_name("Trial1");
+  std::string group_name("Group1");
+
+  // Create a field trial with some params.
+  FieldTrialList field_trial_list(nullptr);
+  FieldTrialList::CreateFieldTrial(trial_name, group_name);
+  std::map<std::string, std::string> params;
+  params["key1"] = "value1";
+  params["key2"] = "value2";
+  FieldTrialParamAssociator::GetInstance()->AssociateFieldTrialParams(
+      trial_name, group_name, params);
+  FieldTrialList::InstantiateFieldTrialAllocatorIfNeeded();
+
+  // Clear all cached params from the associator.
+  FieldTrialParamAssociator::GetInstance()->ClearAllParamsForTesting();
+
+  // Check that we fetch the param from shared memory properly.
+  std::map<std::string, std::string> new_params;
+  FieldTrialParamAssociator::GetInstance()->GetFieldTrialParams(
+      trial_name, group_name, &new_params);
+  EXPECT_EQ(new_params["key1"], "value1");
+  EXPECT_EQ(new_params["key2"], "value2");
+}
+
 }  // namespace base